package com.qms.repast.weidgets.common;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;

/**
 * @author 泅渡者
 * @date 2018/9/15 0015
 * @describe:
 */
public class SideBar extends View {
	/**
	 * 触摸事件
	 */
	private OnTouchingLetterChangedListener onTouchingLetterChangedListener;
	/**
	 * 26个字母
	 */
	public static String[] b = {"A", "B", "C", "D", "E", "F", "G", "H", "I",
			"J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
			"W", "X", "Y", "Z", "#"};
	/**
	 * 选中
	 */
	private int choose = -1;
	private Paint paint = new Paint();

	private TextView mTextDialog;

	/**
	 * 为SideBar设置显示字母的TextView
	 *
	 * @param mTextDialog
	 */
	public void setTextView (TextView mTextDialog) {
		this.mTextDialog = mTextDialog;
	}


	public SideBar (Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public SideBar (Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public SideBar (Context context) {
		super(context);
	}

	/**
	 * 重写这个方法
	 */
	@Override
	protected void onDraw (Canvas canvas) {
		super.onDraw(canvas);
		// 获取对应高度
		int height = getHeight();
		// 获取对应宽度
		int width = getWidth();
		// 获取每一个字母的高度
		int singleHeight = height / b.length;

		for (int i = 0; i < b.length; i++) {
			paint.setColor(Color.rgb(255, 90, 0));
			paint.setTypeface(Typeface.DEFAULT);
			paint.setAntiAlias(true);
			paint.setTextSize(28);
			// 选中的状态
			if (i == choose) {
				paint.setColor(Color.parseColor("#3399ff"));
				paint.setFakeBoldText(true);
			}
			// x坐标等于中间-字符串宽度的一半.
			float xPos = width / 2 - paint.measureText(b[i]) / 2;
			float yPos = singleHeight * i + singleHeight;
			canvas.drawText(b[i], xPos, yPos, paint);
			paint.reset();// 重置画笔
		}

	}

	@Override
	public boolean dispatchTouchEvent (MotionEvent event) {
		final int action = event.getAction();
		// 点击y坐标
		final float y = event.getY();
		final int oldChoose = choose;
		final OnTouchingLetterChangedListener listener = onTouchingLetterChangedListener;
		// 点击y坐标所占总高度的比例*b数组的长度就等于点击b中的个数.
		final int c = (int) (y / getHeight() * b.length);

		switch (action) {
			case MotionEvent.ACTION_UP:
				choose = -1;
				invalidate();
				if (mTextDialog != null) {
					mTextDialog.setVisibility(View.INVISIBLE);
				}
				break;

			default:
				if (oldChoose != c) {
					if (c >= 0 && c < b.length) {
						if (listener != null) {
							listener.onTouchingLetterChanged(b[c]);
						}
						if (mTextDialog != null) {
							mTextDialog.setText(b[c]);
							mTextDialog.setVisibility(View.VISIBLE);
						}

						choose = c;
						invalidate();
					}
				}

				break;
		}
		return true;
	}

	/**
	 * 向外公开的方法
	 *
	 * @param onTouchingLetterChangedListener
	 */
	public void setOnTouchingLetterChangedListener (
			OnTouchingLetterChangedListener onTouchingLetterChangedListener) {
		this.onTouchingLetterChangedListener = onTouchingLetterChangedListener;
	}

	/**
	 * 接口
	 *
	 * @author coder
	 */
	public interface OnTouchingLetterChangedListener {
		/**
		 * 字母改变监听
		 *
		 * @param s
		 */
		void onTouchingLetterChanged (String s);
	}


}